C ++我们可以在函数里面有函数吗？ [英] C++ can we have functions inside functions?

问题描述

我的意思是

int main(){
  void a(){
  //code
  }
  a();
}

推荐答案

否，C ++不支持。

No, C++ doesn't support that.

也就是说，你可以有本地类，它们可以有函数（非 static 或 static ），所以你可以得到一些扩展，虽然它有点kludge：

That said, you can have local classes, and they can have functions (non-static or static), so you can get this to some extend, albeit it's a bit of a kludge:

int main() // it's int, dammit!
{
  struct X { // struct's as good as class
    static void a()
    {
    }
  };

  X::a();

  return 0;
}

但是，我会问这个问题。每个人都知道（好，现在你做，反正：））C ++不支持局部函数，所以他们习惯于没有它们。然而，他们不被使用，那个kludge。我会花很多时间在这段代码，以确保它只是在那里允许本地函数。不好。

However, I'd question the praxis. Everyone knows (well, now that you do, anyway :)) C++ doesn't support local functions, so they are used to not having them. They are not used, however, to that kludge. I would spend quite a while on this code to make sure it's really only there to allow local functions. Not good.

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